potter



Patented `lune 28, 1927.

unimo stares" PATENT orifice.

. EARL F. retirarse, OF oLnNcon, nLLLnoIs, Als-SIGNOR SUPPLY COMPANY, orCHICAGO, ILLINOIS, aY

To KELLOGG svvrTomaoanol Ann CORPORATION or ILLINoIs.,

SER.

Application filed January '1923. lSerial Nd( 614,964.

My invention relates lo eondensers and has to do more i'nii'tieiilarlywith variable' (condenser with :in :iir dielectric` such as'are noiv ingeneral use in wireless sets, and anl object of in v invention is-theprovision of :in iiiiproveil condenser which is provided w of thevariable type," ith structural 'features in" combination With novelassembly features,

which 'combination produces an improved 'condenser of the above type.-

The condenser ofiny invention is of the I decrenieter type, in 'which arotating4 plate element and its snppoi'ting shaft, as 'a whole,

is eurentriifallylocateil in relation to' thc cirtionl of a lineadjustment element with" the .variable condenser element for linertuning purposes, :ind its association with the varii able condenserrotary movable element.

Another feature ot lmy invention is the provision o'f'a novel fineailjiistment'element' which coinpi-isesn stationary plate and aj movableplatet which is controlled by means of a longitudinallymovable shaftwhich, 'in

associationwvith knob vvhen rotated tothe` right or left, to decrease orincrease i the capacity of the said line adjustment'element,

' 'as the-case may be',canses the'sh'aft to which -the movable 'plate issecuredl to move endvariabl condenser shaft to decreaseV or jn-` .Therotatable plate ,element'B comprises a crease the Space between the'stationaryand movable plate of the Vernier element of the re of my'in-"' be more aptatable element of this condenser. The above featuvention 'as Well as Others will parent by a reading of thespecification.

F or a more complete understanding of 'my invention, reference may behad to the accompanyingdra-wing, in Which 'like reference characters inthe several views denote like parts, and in which:

.Fig l is a front el otl my invention;

Fig. Qis :i plan view of Fig. l; and Fig. 3 lis a. sectional view alongthe line 33 ot Fig. 1 to clearly'illiistrate the rotary plate shaftassembly and the actuating V"tatable element B associatedplateportionAof the condenser. The shaft 17 passesi'alternately throughthe'openings evntion of the condenser Which has associated ther 'plateelement D', which mav' be moved inde-' such as baklitef is prov wise orlaterally in relation to the rotatableprovidedjwhich;

' `Referring"iiow more in vdetail to my in- Avention as illustrated inthe accompanying 'drawing'.fthe condenser comprises a xed plate elementA` i rotatable plate element B,opera tively associated with-the fixedplate element A.

I also provide fa fixed "plate element C independentof th'eleinent A andewith aimovable pendently 1of the' rota'tv ableiueleme'nt'B.z

VThe fixed plate element A comprises a pluralityof' semi-circularlplates 2, of suitable metal;l such as aluininuin each being providedwith orices` ofa size' to receive rods 3;*

-The rods` 3 are inserted alternatelytlirough the orifices of the plates2, and spaceiiv'zis'hers 4', and theirends' which are threaded. Yhaveaserew-th'readed 4 engagement ivith'the and 6 which are providedj'ivithsuitablltapped orilicesfto also provided lwith' orifices, ind an" interme diate. base" 8 of suitable. insiilatioii `niaterialf idedfafnd vorifices in the basef Vin:' ilignmen tfwith the'forifiees of the plate'12; are; ademen' ijrvgiods' 9 whichptvissl .thr'iigli the openings inthe :invlei'i-n`ed i atelljaseA '8; 'their th r'efde'd "en'ds 'h av in gfscrewgtli'readed 'engag'eineiit'vvith the tapped orifices 4the studs 6.'v I'l'iisulation .washers 10 arel also provided:wvhh'fslipover 'the'rods 9 ma' rest against thebottomffa of the plate' 12, and insulationsleeves 1T are'also" 'lpover the rodst9fand" are 16. of'the pla-tes I15and the spacer Washers 18, andfwhen the requisite number are slippedmeans of the fine adjustment element in assol Ciation with the rotatableplate element.. i

threaded, receives -a n `clamps them upon the' openings of a size toreceive a rod 21 which-5f* passes alternately through the openings in'said ears 2t) and spacer washers The ends of the rods 21 are threaded toreceive nuts 23 which clamp the free ends of the plates in proper spacedrelation with each other and, at the saine time, hold the plates inalignment with each upon the shaft 17.

'lhe movable plate element D of the fine adj ustinent portion V of thecondenser, comprises a semi-circular shaped plate and a shaft 31 uponwhich the plate 30 is secured. The shaft 31 has its one end 31 threadedand a nut 32, having screw-threaded engagement with the threaded end 31of the shaft 31, clamps the plate 30 upon the shaft 31. The movableplate 30 is provided with orifices 33 in alignment with the rods 9 andare of a size to slip over the sleeves of insulation 11, which aresupported on the rods 9. Vhen the movable plate 3() is in position asillustrated in Fig. l, the rods 9 and the'supported insulation sleeves11 serve as guides for the movable plate 30 as it is moved laterallywith relation'to its associatedstationary plate 12, as will be morefully, hereinafter,

ldescribed.

The construction and assembly of the fixed plate elements A and C andthe rotatable plate element B and the movable plate D having beendescribed, I will now describe the assembly of the elements A, B, C, andD, as a'whole, to form the completed condenser of my invention. Thefixed vplateielement A of the variable condenser' isl placed Aupon the-intermediate base 8, andthe orifices in the base are made to registerWith the tapped orifices. in the studs 6.: Now, when the element A is inthis position,l the rods 9 l are inserted into the orifices in the base8, and their threaded ends are Ythreadedlinto the tappedv orifices ofthe studs'. The tplate 19. of the fixed element C of the fineAadjustment portion V ofthe condenserwhich-is providedwithvsuitablejorifices which reg-ister with the rods 9,v is nowslippedontne` rods 9 and spacerwashers 35 are placed between the baseand the plate-1210 .'k'eep the said plate 12 :properly spaced' 'from thebottom face of the base 8. Insulation washers 10 are provided which arenow slipped o ver the rods 9 las are also the sleeves of insulation 11for `purposes. as willfpresently be described. The movable `plate 30 ofthe 'Inova` ble element D of the portionV of the condenser, is securedto oneend ofthe shaft 31 as already described andA is Aprovided withorifices which are adapted to-register with the rods 9 and areof a sizeto permit it=to be slipped over the insulation sleeves V11 whichsurround the rods 9. The intermediate base 8 is provided with an orifice36 of a size to permit the insertion of the shaft 31, andwhentlieshaftv31 and its associated plate 30 are in position, as illustratedin the drawing, a base plate 37 provided with oritices which registerwith the rods 9 is slipped on the said rods 9 and the protruding ends ofthe said rods 9 which are threaded, receive nuts 38 which, whentightened, hold the fixed Iplate v12 of the portion V of the condenserbetween the intermediate base 8 and the base plate 37. The shaft 17 ofthe rotatable element B of the condenser, is provided with a centralorifice 39 extending its length and is of a size to permit its beingslipped over the shaft 31 of the movable plate element C of the portionV of the condenser and when in the position as shown dotted in Fig. 2,the said rotatable element B is slipped over the vshaft 31. Vhen theplates 15 of the rotatable element B, register with their respectivespaces 4() between the plates 2 of the fixed 'plate element A, a topplate 42, having an orifice 43, permits the shaft 17 to extendtherethrough and sfrews 44 pass through suitable orifices in the plate42 and have screw-threaded engagement with the studs 5. The end of theshaft 31 is provided with a tapped orifice 45 and the stem 46 of thecontrol button or knob 7 having a threaded portion 47, is adapted tohave a screw-threaded engagement with the tapped orifice 45 in the shaft31 and which, when in position in operative relation with the shaft 31,has'its shoulder 46 engaging the end face 48 of the shaft 31. This stem4G of the-control knob 76 forms a connecting link between the 4movableplate 30 of the Vernier portion V of the condenser and its 'rotarymovement in relation to the longitudinal movement of fthe shaft 31, will`presently be described...

The stem 46 of the knob 76 is provided with an annular .groove 49whichis adapted to receive, a Ufshaped retaining memberv() and which restsinthe enlarged opening 51 in the. end of the shaft 17. The Wall of theshaft 17x rotrudes slightly above the face of the mem er 'iOandI thisportion is spun over tov retain the stein A46 ofv the knob 76 inpostitionagainst' lateral movement, but permits the same to be rotated.,-Whe'n the stem 46 of the .knob76r and` shaft-31 are connected and theend 4.face-of the' shaft 31 engages the shoulder 46w'of the stem 46, themovable 'plate` 30 oft-he element -C .of thevernier portion V of theycondenser rests against the insulation spacer washers 10 .whichvkeep thelmovable plate 30 and stationary plate 12 of ,Mesero denser to be movedlongitudinally in yrelation to the rotary motion 'of the 'stem 46 of theknob 76` due to the well known-screw principle, and whichoperationwillbeumore fully, hereinafter, described." f

A portion-of the stern' 46 ing for the same'whenV rotated and the'said'orifice 39 also forms abearing forthe lon'gtudinally movable shaft 31.'10 prevent' rotation of the shaft 31 when thelmob `76`is rotated, I-have providedl the portion vofthe shaft 31 which extends through theshaft 17, with two flattened faces'GU; anda-retaining 'plate memberl--provvidedHwith aj bifurcated end 61', straddlesv theishaft 31 toengage the'flattened faces 60'onthe' shaft 81 thus preventing rotarymovement of the shaft. 31. The plate 61 is secured to the bottom face'of the base 8 bylmea'ns ofascrew 65 and-nut66. -f i A combined lthrust`andl frictonalleaf .spring 67. The tension of2tliefspring I67'is such astobearzagainst' the bottom' face of the shaft-17 to placeiit'sfface in'fric'tionalf'ngagementwith the bottom faceofs'aidshaft so that astherotatable* elementfB is rotated for trilling purposes,1 vit will?fr'eina'in"A ii'1""ny position it is set due to thisfrictiolfengagement.The spring 67 also acts as a thrust means as the tension of the spring67 is such as to force the shaft 17 and its parts as a whole upward inrelation to Fig. 1 and if any downward pressure is exerted upon theshaft 17, the tension Yof the spring 67 is such as to prevent the shaftfrom being forced downward and cause the rotatable plates 15 to envagethe fixed plates 2 to discharge the condenser when in use.

A Suitable dial is secured to the shaft 17 by suitable means to permitthe ready manipulation of the rotatable element B and the knob 76, andits stem 46 permits the ready manipulation of the movable element D ofthe portion V of the condenser. A terminal 77 is secured to the base 37by means of a screw 78 and is connected by means of a flexible lead 79to the terminal 80 of the movable plate '30 of the fine adjustmentportion V of the condenser, forming connection means for the externalcircuit.

Having described the apparatus which comprised my invention, I will nowdescribe the method of manipulating the condenser of my invention fortuning purposes. When the dial 75 is turned, the rotatable element B isrotated independent of 4tion' V5 -of theV` condenser the shaft ofthelmovable element D of the Afine adjustment portion V and when propertuning is accomplished through the medium lof 'the'zr'otatable elementll in' association t with thejfiz-:ed Eelement"'15r,'the said ieleinentextending into i lthe orifice 39 of the shaft; 17, forms a bear- Bisheldin'positiou by'means of the spring 67; If a `finer-tuning is desiredto clarify, the knob 76, associated with the portion V, isrotated in acounter-clockwise direction Afor the purpose of description. The stein'A 46is also rotated in a counter-clockwise directi'o'n :1nd,: due to'the'screw-connection "-17%15 between the stem 46 and the shaft 31,' thesaidshaft '31- is moved iongitudinally ima-downward,:direction and," asthe niovablefplate' of'lthe portion V of the 'condenser is also'set'ured "to the shaft 31,

"th'eplate '30 is. moved away from its asso-l ciated'stationary plate12. The rods 9 forni '.guidi'ng means for themovablel plate 30 to ffpermit freemovement 'of thesha'ft 31 in Aa longitudinal direction.spring 67 is- `provided-'for theIrotatable' plate "plate 3() away fromits associated stationary plate-i12 to decrease the lcapacity of' theporand, to again increase the capacity', the knobi76 1s turned in-a*cloel\v`ise direct-ion causing its associated stem 46 to rotate inthe -same direction and. due to the screwconnection L17-15 between 'thestem 46 an'd'shaft 31,"this rotary-motion lilof'the'steni 46 transmits-longitudinal mol=tionftotlie`shft 31`an`d causes thesh'aft 3l :to bemovednp to carry the plate 30 closer to its associated'stationary 'plate12 to in- '-'creasej the-capacity oflithe' adjustable por` tion V' ofthe condenser.' f-

ir-While'I have sdenser 'offlmy' i described the 'variable coninvcntionlinits preferred form, it is to be understood that changes andmodifications will readily suggest themselves by those skilled in theart, and I desire to cover all such changes and modifications as comewithin the spirit and scope of the appended claims.

Having described my invention what I claim as new and desire to secureby United States Letters Patent is:

1. In a device of the character described including a fixed element anda rotatable element, a shaft for said rotatable element, a second fixedelement, a movable element associated with said second fixed element, ashaft for said movable element extending through the shaft of saidrotatable element, and means rotatably secured in said first shaft formoving the shaft of said movable element longitudinally in the firstsaid shaft.

2. In a device of the character described, including a fixed element anda rotatable element, a shaft for said rotatable element, a second fixedelement, a movable element associated with said second fixed element,means for rotating said first shaft, a shaft for said movable elementextending through the shaft of said rotatable element and slidablelongii tudinally therein, and means rotatably secured in said firstshaft 'or moving the shaft of said movable element longitudinallylindependent of the rotary movement of said first shaft. I

3. In a device of the character' described including a fixed element anda rotatable element, a shaft for `said rotatable element, a second fixedelement, a movable elementassociated with said second fixed element, ashaft for said movable element extending through the shaft of saidrotatable element, a knob provided with a stem which has screw-threadedengagement with said shaft, rotatable to impart longitudinal movement tosaid shaft of said movable element.

et. A condenser comprising a fixed element and a rotatable element, asecond fixed element, a movable element associated with said secondfixed element, concentric shafts for said rotatable element and saidmovable element for controlling the same, means for turning the shaft ofsaid rotatable element, and means rotatably secured to the shaft of saidrotatable element l'or moving the shaft of said movable. elementlongitudinally.

5. A condenser comprising two sets of stationary plates, a set ofrotatable plates associated with one of Said sets of stationary plates,a movable plate associated with said other stationary plate, concentricshafts for said rotatable element and said movable element forcontrolling the. same, means for turning the shaft of said rotatableelement,

vJanuary 1923. and means associated with themshaft of'said l, movableelement for longitudinally moving said shaft independent of the rotarymovementor the shaft of said rotary eienant.

6. In a device of the character described including a set of stationaryplates and a set` ing said stem in said shaft, a screw connection linkbetween said stem and the shaft of said movable element having threadedengagement with shaft of said movable elcx-nent to impart longitudinalmovement to the shaft oi said movable element when said knob and saidstem as a whole is turned.

7. In a device of the character' described including a rotary elementand a fixed element, a second fixed element and a movable elementVassociated therewith, concentric shafts for said rotary element andsaid movable element, rotatable means for the shaft of said rotaryelement, a stem rotatably secured in the shaft of lsaid rotary elementand rotatable independent of the shaft of said rotary element, athreaded extension of said stem engaging a threaded orifice in the shaftof said movable element to impart I longitudinal movement to the shaftof' said movable element when'the stem is rotated.

Signed'by lne at Chicago-in the county ot Cook andvState of Illinoisthis 24th day of EARL r. POTTER.

